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pointer.h

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00001 // Copyright (C) 2001 Open Source Telecom Corporation.
00002 //  
00003 // This program is free software; you can redistribute it and/or modify
00004 // it under the terms of the GNU General Public License as published by
00005 // the Free Software Foundation; either version 2 of the License, or
00006 // (at your option) any later version.
00007 // 
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 // 
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the Free Software 
00015 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00016 // 
00017 // As a special exception to the GNU General Public License, permission is 
00018 // granted for additional uses of the text contained in its release 
00019 // of Common C++.
00020 // 
00021 // The exception is that, if you link the Common C++ library with other
00022 // files to produce an executable, this does not by itself cause the
00023 // resulting executable to be covered by the GNU General Public License.
00024 // Your use of that executable is in no way restricted on account of
00025 // linking the Common C++ library code into it.
00026 // 
00027 // This exception does not however invalidate any other reasons why
00028 // the executable file might be covered by the GNU General Public License.
00029 // 
00030 // This exception applies only to the code released under the 
00031 // name Common C++.  If you copy code from other releases into a copy of
00032 // Common C++, as the General Public License permits, the exception does
00033 // not apply to the code that you add in this way.  To avoid misleading
00034 // anyone as to the status of such modified files, you must delete
00035 // this exception notice from them.
00036 // 
00037 // If you write modifications of your own for Common C++, it is your choice
00038 // whether to permit this exception to apply to your modifications.
00039 // If you do not wish that, delete this exception notice.  
00040 
00041 namespace ost {
00042 
00043 template <class T>
00044 class Pointer
00045 {
00046 protected:
00047         unsigned *ptrCount;
00048         T *ptrObject;
00049 
00050         void ptrDetach(void)
00051         {
00052                 if(ptrCount && --(*ptrCount)==0)
00053                 {
00054                         delete ptrObject;
00055                         delete ptrCount;
00056                 }
00057                 ptrObject = NULL;
00058                 ptrCount = NULL;                
00059         }
00060 
00061 public:
00062         explicit Pointer(T* ptr = NULL) : ptrObject(ptr)
00063         {
00064                 ptrCount = new unsigned;
00065                 *ptrCount = 1;
00066         }
00067         
00068         Pointer(const Pointer<T> &ref)
00069         {
00070                 ptrObject = ref.ptrObject;
00071                 ptrCount = ref.ptrCount;
00072                 ++(*ptrCount);  
00073         }
00074 
00075         inline virtual ~Pointer()
00076         {
00077                 ptrDetach();
00078         }
00079 
00080 
00081         Pointer& operator=(const Pointer<T> &ref)
00082         {
00083                 if(this != &ref)
00084                 {
00085                         ptrDetach();
00086                         ptrObject = ref.ptrObject;
00087                         ptrCount = ref.ptrCount;
00088                         ++(*ptrCount);
00089                 }
00090                 return *this;
00091         }
00092 
00093         inline T& operator*() const
00094                 {return *ptrObject;};
00095 
00096         inline T* getObject() const
00097                 {return ptrObject;};
00098 
00099         inline T* operator->() const
00100                 {return ptrObject;};
00101 
00102         inline bool operator!() const
00103                 {return (*ptrCount == 1);}; 
00104 
00105         inline int operator++() const
00106                 {return ++(*ptrCount);};
00107 
00108         int operator--() const
00109         {
00110                 if(*ptrCount == 1) 
00111                 {
00112                         delete this;
00113                         return 0;
00114                 }
00115                 return --(*ptrCount);
00116         }
00117 };      
00118 
00119 }

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